Common faults and solutions for PET bottle blowing-part 2

January 04, 2022

Q6: The bottom of the bottle is too thin

Reasons:

1. Start blowing too early

2. The bottom temperature is too high

3. The bottom of the embryo tube is too thin

Solutions:

1. Delay the start of blowing time

2. Lower the bottom temperature

3. Increase the thickness of the bottom of the embryo tube

Q7: The bottle clamping line is obvious

Reasons:

1. Insufficient clamping pressure

2. The sealing time is too early

3. Mold problem

4. The size of the germ tube tooth mouth does not match the mold

Solution:

1. Increase the clamping pressure and adjust the angle of the clamping support rod (<5 degrees)

2. Move back the position of the mold clamping stroke switch

3. Repair the mold or check the assembly position of the mold, such as whether the guide post is loose, or whether the mold is not tightly pressed

4. Repair the matching position of the mold teeth

Q8: The bottom of the bottle or the bottleneck is rolled up, and the material accumulates

Reasons:

1. Delayed blowing time is too long

2. One roll, one good

3. The temperature at the material accumulation is too low

4. The air pressure for the action is unstable, which affects the descending speed of the stretching rod

Solutions:

1. Shorten the delayed blowing time or reduce the descending speed of the stretch rod

2. Lower the gas volume on one side of the reel bottle

3. Increase the heating temperature of the embryo tube

4. Add a gas storage tank to the action gas source, or shorten the gas supply pipeline

Q9: Stretching perforation at the bottom of the bottle

Reasons:

1. Insufficient temperature and no penetration

2. Delay stretching time is too long

3. The stretch ratio is too large

4. The bottom of the embryo tube is too thin

5. The stretched head is too sharp

Solutions:

1. Warm up

2. Shorten the delay stretching time

3. Reduce stretch ratio

4. Improve the bottom design of embryo tube

5. Trimming and stretching the head

Q10: Bottom blasting

Reasons:

1. The delayed blowing time is too short

2. The delayed mold opening time is too short

3. The temperature is too high

4. The exhaust valve does not work

Solutions:

1. Lengthen the delay blowing time or increase the descending speed of the stretching rod

2. Lengthen the delay opening time

3. Cool down

4. Clean the exhaust valve with gasoline

The above is the Common faults and solutions for PET bottle blowing-part 2 we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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